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Unaudited Condensed Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Statements of Income [Abstract]    
Revenues $ 111,166 $ 111,885
Costs and expenses:    
Instruction and educational support 58,098 59,697
Marketing 18,298 16,681
Admissions advisory 4,349 3,993
General and administration 10,329 11,655
Total costs and expenses 91,074 92,026
Income from operations 20,092 19,859
Investment income 100 78
Interest expense 160 1,273
Income before income taxes 20,032 18,664
Provision for income taxes 7,612 7,279
Net income $ 12,420 $ 11,385
Earnings per share:    
Basic $ 1.17 $ 1.08
Diluted $ 1.15 $ 1.06
Weighted average shares outstanding:    
Basic 10,596 10,579
Diluted 10,782 10,738